[Koha-bugs] [Bug 20582] Turn Koha into a Mojolicious application

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20582

--- Comment #29 from Jerome Charaoui <jcharaoui at cmaisonneuve.qc.ca> ---
I'd like to share some results of our first Koha/Mojolicious lab that happened
earlier today. Functionality-wise everything was up to par. One thing I noticed
is that the 10 hypnotoad workers quickly grew memory hungry. Here is the
smemstat output:

  PID       Swap       USS       PSS       RSS User       Command          
  8719    28.3 M   501.0 M   502.7 M   525.6 M root      
/usr/share/koha/bin/koha
  8718    71.6 M   484.9 M   486.6 M   509.4 M root      
/usr/share/koha/bin/koha                      
  8726    28.3 M   483.7 M   485.4 M   508.3 M root      
/usr/share/koha/bin/koha
  8724    28.3 M   479.7 M   481.4 M   504.4 M root      
/usr/share/koha/bin/koha
  8721    28.3 M   454.2 M   456.0 M   478.9 M root      
/usr/share/koha/bin/koha    
  8720    28.6 M   452.0 M   453.7 M   476.6 M root      
/usr/share/koha/bin/koha
  8723    28.3 M   427.4 M   429.1 M   451.9 M root      
/usr/share/koha/bin/koha               
 14932    28.3 M   306.5 M   308.2 M   330.9 M root      
/usr/share/koha/bin/koha
 23653    28.4 M   247.6 M   249.4 M   272.3 M root      
/usr/share/koha/bin/koha
 23103    28.3 M   240.3 M   242.1 M   264.9 M root      
/usr/share/koha/bin/koha

We can see all the workers using up between 240 to 500M of unshared memory.
When hypnotoad starts fresh, each worker uses up about 125M.

This is the current hypnotoad config:

{
  basepath => '/usr/share/koha',
  hypnotoad => {
    listen  => ['http://127.0.0.1:3000'],
    workers => 10,
    pid_file => '/run/koha/koha-app.pid'
  }
};

In order to deal with this I modified the config by adding "accepts => 200" so
that workers get recycled more quickly. If you have any other ideas as to how
we could deal with memory usage, please let us know!

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